Definition of fiber optic modules - classification - parameters

In fiber communication, we need to know some basic knowledge about fiber modules, such as concepts, categories, parameters, brands and so on. Here for a brief introduction to this knowledge.

Fiber module definition:

Optical fiber communication system in the important device, can carry out the conversion between the photoelectric signal, with the receiving and transmitting function. Fiber optic module usually consists of optoelectronic devices, functional circuits and optical interfaces, optoelectronic devices, including the launch and receive two parts.

Classification of fiber modules:

According to the rate of points: Ethernet applications 100Base (100M), 1000Base (Gigabit), 10GESDH applications 155M, 622M, 2.5G, 10G.

According to the package points: 1 × 9, SFF, SFP, GBIC, XENPAK, XFP, 1 × 9 package - welding optical module, the general speed is not higher than gigabit, more use SC interface. SFF package - welding small package optical module, the general speed is not higher than gigabit, more use of LC interface. SF (SmallFormFactor) small package optical module uses advanced precision optical and circuit integration process, the size of only ordinary duplex SC (1X9) type fiber transceiver module half, in the same space can increase the number of optical ports. GBIC package - hot-swappable Gigabit interface optical module, using SC interface.

GBIC is an abbreviation for GigaBitrateInterfaceConverter, an interface device that converts gigabit electrical signals into optical signals. SFP package - hot-swappable small package module, the current maximum rate of up to 4G, more use of LC interface. The abbreviation for SFPSMALLFORMPLUGGABLE can be easily understood as an upgraded version of GBIC. XENPAK package - used in 10 Gigabit Ethernet, using SC interface. XFP package - 10G optical module, can be used in 10 Gigabit Ethernet, SONET and other systems, more use of LC interface.

The main parameters of the fiber module:

Average Optical Power (TxLOP: Optical Average Power) Average transmit optical power refers to the arithmetic mean of the optical power when the signal logic is 1 and the optical power at 0. P0 + P1 PAVG = 2 (dBm)

(ER: Extinction Ratio) The ratio of the optical power when the signal logic is 1 is the magnitude of the optical power when it is 0. The formula is: P1ER = 10log P0 (dB) ER represents the extinction ratio in units of dB, P1 And P0 respectively represent the optical power at logic 1 and 0, respectively.

Receiver Sensitivity measures the minimum average optical power received by the receiver in order to ensure a certain bit error rate (1 × 10exp (-12)) in dBm. Bit error rate means that the bit error rate is measured over a longer period of time The ratio of the number of bit errors received after the photoelectric conversion of the receiving end is given to the output of the error meter.

The LOS Assert and LOS Dessert outputs an electrical signal whose potential level reflects whether the received optical signal strength is sufficient to compare the potential to the preset potential to determine the light Whether the signal is lost, the potential comparison is achieved by using a comparator with a certain hysteresis effect, usually using the optical power corresponding to the preset electrical signal as an indicator in dBm.

Eye Mask Margin Eye opening degree is the degree at which the eye pattern is "open" at the best sampling point, and the opening degree of the non-distorted eye view should be 100 [[%]]. Eye template The template tolerance is the maximum expansion percentage of the template that the eye template is expanded until the sample point of the eye is entered into the expansion area.

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